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DS1307 RTC problem

Anik , 02-13-2024, 07:55 PM
Anik , 02-13-2024, 07:56 PM
The Diagram looks like this, its working when the back up battery is not connected but when the back up battery connected its not working
Anik , 02-13-2024, 07:58 PM
QDrives , 02-13-2024, 10:04 PM
The DS1307 is for 5V operation (4.5...5.5V recommended).
Then there is "Power-Fail Voltage (VBAT = 3.0V)" which is ~1.25*Vbat. When your battery is 3.0V, your supply needs to be 3.75V or more (typical). Hence, it does not work when you have the battery installed.
Anik , 02-14-2024, 07:51 PM
Yes sir, Its working now I have tested it both side I have added voltage divider on backup battery and made it 2.2V and keep the Vcc 3,3V. On the other side I made the Vcc 5V and backup 3V directly from the battery. Both working. Thank you so much.
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